package com.nj.framework.util;

import java.security.MessageDigest;

/**   
*    
* 项目名称：publicservice   
* 类名称：MD5   
* @version
* 类描述：MD5的加密方法
* @version   
* 创建人：王哲民   
* @version
* 创建时间：2012-4-26 下午05:26:25 
* @version  
* 修改人：王哲民    修改时间：2012-4-26 下午05:26:25   
* @version
* 修改备注：   
*
*/
public class MD5 {

	/**
	 * 
	 * encode MD5加密
	 * 
	 * @param String
	 * 
	 * @return String
	 * 
	 * @throws
	 * 
	 * @since CodingExample　Ver(编码范例查看) 1.1
	 */
	public final static String encode(String s) {
		char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
				'a', 'b', 'c', 'd', 'e', 'f' };
		try {
			byte[] strTemp = s.getBytes();
			MessageDigest mdTemp = MessageDigest.getInstance("MD5");
			mdTemp.update(strTemp);
			byte[] md = mdTemp.digest();
			int j = md.length;
			char str[] = new char[j * 2];
			int k = 0;
			for (int i = 0; i < j; i++) {
				byte byte0 = md[i];
				str[k++] = hexDigits[byte0 >>> 4 & 0xf];
				str[k++] = hexDigits[byte0 & 0xf];
			}
			return new String(str);
		} catch (Exception e) {
			return null;
		}
	}
	
	public final static String encode(String s, String encoding) {
		char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
				'a', 'b', 'c', 'd', 'e', 'f' };
		try {
			byte[] strTemp = s.getBytes(encoding);
			MessageDigest mdTemp = MessageDigest.getInstance("MD5");
			mdTemp.update(strTemp);
			byte[] md = mdTemp.digest();
			int j = md.length;
			char str[] = new char[j * 2];
			int k = 0;
			for (int i = 0; i < j; i++) {
				byte byte0 = md[i];
				str[k++] = hexDigits[byte0 >>> 4 & 0xf];
				str[k++] = hexDigits[byte0 & 0xf];
			}
			return new String(str);
		} catch (Exception e) {
			return null;
		}
	}

	public static void main(String[] args) {
		System.out.print(MD5.encode("abc"));
	}
}

